Is there a home filter that can be used to reduce the level of PFAS in drinking water?
Public Health Madison Dane County does not recommend that people invest in filters or bottled water.
However, people searching for peace of mind may be interested in the following information about filtration.
The Minnesota Pollution Control Agency and Minnesota Department of Health tested a small, in-home granular activated carbon (GAC) filter for PFAS removal. You can view the results here. Please note the units of this study are in ppb (parts per billion) – we report PFAS levels in ppt (parts per trillion) which is 1,000 times smaller.
The agencies report that this type of filter was effective at removing PFC or PFAS from drinking water. A filter certified to meet ANSI/NSF P473 will reduce PFOA & PFOS down to the EPA Lifetime Health Advisory Level of 70 parts-per-trillion. However, detections of PFOA & PFOS in Madison wells are already significantly lower than the health advisory level.
As the Minnesota study showed, any filter will lose its effectiveness over time so it is important to install and maintain filters according to the manufacturer instructions. While not specifically rated and/or certified for PFAS removal, some types of activated carbon (charcoal) and reverse osmosis filters might also reduce PFAS levels in water.
The Michigan Department of Environmental Quality has put together a fact sheet detailing in-home PFAS filtration methods.